Thank you for the post. Just to double check:1) What is the board you used? 2) Driver version for the I210 ethernet controller? 3) What is the software you used for the transmission? (in case there is) 4) What is the switch model used?

3) AVnu Open-AVB software tools (avtp_pipeline, standalone applications) are used to communicate with Intel igb lib which is used for transmission (the register space of the I210 is mapped into Intel igb lib).

4) We are using two testcases:

- two I210 adapters are connected via AVB switch;

- two I210 adapters are connected one-to-one without any switches;

In both cases behavior is the same - each and every TX descriptor transmitted via Intel igb lib contains E1000_TXD_STAT_EC (i.e 0x00000002, Excess Collisions) bit in status field.

Standard best-effort LAN traffic via rx-tx-queue(3) seems to be working (i.e. ping, file transfers work). But we've also noticed a significant number of dropped standard RX packets reported by ifconfig. And it grows approx. by 1 dropped packet every 1-2 seconds.

Have you contacting HP* already as this is an HP OEM card, please make sure you are using the driver from HP* correctlyAre these card came with the server directly from HP* or just HP* OEM retail model?

Please update me if HP* have provide any support in case you contacted them already.